Multiple choice

If cost prices of 100 note books is same as selling price of 80 note books. What is the percent gain?

  1. 15%

  2. 30%

  3. 25%

  4. 20%
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

If CP of 100 notebooks equals SP of 80 notebooks, let CP per notebook be x. Then CP of 100 = 100x, so SP of 80 = 100x, thus SP per notebook = 100x/80 = 1.25x. Profit = SP - CP = 1.25x - x = 0.25x. Profit percentage = (0.25x/x) × 100 = 25%. This is a classic CP-SP relationship problem.

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